Ng, G. S. | Search NASA

NASA NTRS1986

Composite Fasteners

Flexible composite fasteners made of polyvinyl chloride or other resilient synthetic material designed for joining together various materials which may vary slightly in thickness during use. Fasteners easily installed and removed by hand and maintain approximately same tension in bonding materials together, regardless of subsequent movements of materials. Design and choice of material of new fasteners enables variety of uses, as book binders, hole sealers, insulating fasteners for electronic circuitry, or break-away energy-absorbing fasteners for vehicles in crashes.

Ng, G. S.↗

NASA NTRS1976

Thermal and Structural Analysis of Helicopter Transmission Housings Using NASTRAN

The application of NASTRAN to improve the design of helicopter transmission housings is described. A finite element model of the complete forward rotor transmission housing for the Boeing Vertol CH-47C helicopter was used to study thermal distortion and stress, stress and deflection due to static and dynamic loads, load paths, and design optimization by the control of structural energy distribution. The analytical results are correlated with test data and used to reduce weight and to improve strength, service life, failsafety, and reliability. The techniques presented, although applied herein to helicopter transmissions, are sufficiently general to be applicable to any power transmission system.

Howells, R. W.↗